Hair straightening apparatus



FIG. 1 is a perspective view of a hair straightening apparatus, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line shown are included for the purpose of illustrating portions of the hair straightening apparatus which form no part of the claimed design. 

CLAIM The ornamental design for a hair straightening apparatus, as shown and described. 